Office



W M. FISHER. Boiler-Furnace.

'4 'mL Svj E -1- wmw' jwemm- N. PETERS, PHOTC-LITHOGRAFHER, WASHINGTON,D c.

UNITED. STATES PATENT- FFICE.

WILLIAM M. FISHER, OF CINCINNATI, OHIO, ASSIG'NOR OF FOUR-FIFTHS OF HISRIGHT TO CHARLES LAWRENCE, AUGUSTUS LAWVRENOE, JOHN ARMSTONG GANO,ANDTHOMAS 'IlNSLEY HEATH.

BOILER-FURNACE.

SPECIFICATION formingpart of Letters Patent No. 225,051, dated March 2,I880.

' Application filed July 3, 1879.

To all whom it may concern Be it. known that I, WILLIAM MACK Frsnnn, ofCincinnati, in the county of Hamilton and State of Ohio, have inventedcertain new and useful Improvements in Boiler-Furnaces; and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappcrtains to make and use the same, rcferencebeing had to theaccompanying drawings, and to letters of reference marked thereon, whichform a part of this specification. I This invention relates to certainim provements in steam -boilcrs, more especially designed for locomotiveand marine boilers; and its object primarily is the attainment of a moreperfect combustion and consumption of the combustible gases proceedingfrom the furnace of such a boiler.

To this end the invention consists in arranging in the rear of thefire-box, and between it and the front flue-sheet, a chamber with aperforated bottom for supplying the hot gases from the fire-box withjets of air in quantities 2 5 sufficient to attain a more perfectcombustion of such gases as they enter the flues of the boiler. Thefire-box and air-supply chamber are divided by a water-partitionprovided with a large opening for the exit of the gases from 0 thefire-box, and with legs on either side of such opening, joining thecrown-sheet of the fire-box, where one leg terminates, while the otherleg extends up to a point above the water-line in the boiler and opensin the steam- 3 5 space thereof, in consequence of which construction agood circulation will be maintained through such water-partition.

I11 the annexed drawings, Figure 1 is a perspective view of asteam-boiler provided with my invention. Fig. 2 is a transverse sectionin planes indicated by the broken line at m of Fig. 1. Fig. 3 is atransverse section in planes indicated by the broken line y y of Fig. 1.

The same letters of reference are used in all 4 5 the figures in thedesignation of the same parts.

The fire-box A, wherein coal is to be burned on the grate-surface B, maybe of the ordinary construction, except that the back is formed by awater-partition, 0, instead of by the front flue-sheet, D, of theboiler, as is usual. Between this water-partition O and the frontfluesheet, D, a chamber, E, is formed, the area of which may be aboutone-third (more or less) of that of the grate-surface of the fire-box.The bottom of this chamber E has multitudinous perforations 6, throughwhich air enters the chamber in numerous fine jets. The waterpartition 0is provided with a large opening, 0, extending down from the crown-sheetof the fire-box for the escape of the gases, smoke, &c., from thefire'box. On their way to the fines of the boiler these products ofcombustion are met by and are mingled with the airjets entering thebottom of chamber E, and

are thus supplied with the necessary amount of oxygen to insure thecomplete combustion, practically so, of all the combustible gases andparticles escaping from the fire-box in a more or less imperfect stateof combustion.

The water-partition has a leg extending upwardly on either side of theopening (3. The

leg (3 terminates with the crownsh'eet of the fire-box and opens intothe water-space of the boiler. The leg 0 extends through the crown- 7 5sheet of the fire-box, and its open end reaches into the steam-space ofthe boiler. By this means a rapid circulation is effected in thewater-partition, which is all important by rea son of its having toendure the intense heat of the furnace.

The bottom of the water-partition may be level, as shown in Fig. 1, orit may be curved, with a View of facilitating the circulation throughit, in which case the grate-surface should be curved correspondingly, asshown in Fig. 2.

The perforated bottom of the air supply chamber E is preferably made oftwo plates,

E E, hinged, as shown in Fig. 3, so that they may be turned down into aposition for discharging dust and cinders, if such should be depositedthereon.

The plates may be operated by bell-cranks E and rods E or by any othersuitable or '95 preferred means. Steam-pipes E may also be arranged toblow steam over and through the plates E, if necessary, to clean theperforations. These steam-pipes might discharge into perforated crosspipes arranged across the hinged ends of the plates E, and theseperforated cross-pipes might constitute the shafts or pintles on whichor by which the plates are hinged, and the arrangement of the partsmight be such that the lowering of the plates E would be accompanied byautomatic opening of cocks and the blowing of steam over and through thesaid plates.

Ioprefer to extend the elongated leg of the water-partition into thesteam-space of the boiler in most cases; but it will be found that itsextension up to near the Water-level in the boiler will answer in manycases to effect the desired rapid circulation through the saidwater-partition; and such modification I consider a part of myinvention.

What I claim as myinvention, and desire to secure by Letters Patent, is-

In a steam-boiler, the water-partition provided with water-legs, oneterminating flush with the crown-sheet of the firebox, and with 2 5another leg, on the opposite side, extending into the steam-space of theboiler, in combination with an auxiliary combustion-chamber between thesaid water-partition and the tubesheet, the bottom of said'chamber beingpro- 0 vided with a hinged perforated bottom, allowing air in jets,whereby a more perfect combustion is produced, and a better circulationof water is maintained, substantially as described. 3 5

In testimony that I claim the foregoing I have hereunto set my hand this28th day of June, 1879.

WM. MACK FISHER.

Witnesses FRED A. J oHNsON, OHAs. LAWRENCE.

